Der Spiegel: Rearchers Puzzled About Global Warming Standstill ‘The climate has recently developed differently than predicted. The warming has stalled for 15 years’

'The upward trend in the average global temp has not continued since 1998...The UK Met Office has recently forecast that the warming standstill could continue until end of 2017 – despite rapid increase in ghgs. Then global warming would have stalled for 20 years. How many years –goes a now common question – has the temp stands to last until climate scientists start to reconsider their forecast of future warming?'